CRM Dynamics not displaying correctly within internet explorer

Hi,

Several of our CRM users have been experiencing issues whereby when CRM Dynamics attempts to open an Internet Explorer Window (say when clicking a lead etc..) most of the display is missing. See attached image - CRM -Internet Explorer error..

However, whenever I add the CRM URL to the list of 'Local Intranet' sites it seems to fix this issue for a period of time and then the issue will soon return.

We also have another user experiecing issues with the IE pop up blocker, however their CRM dynamics was working fine until recently. See image attached - CRM pop up blocker.